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1、Unit 5,The Villain in the Atmosphere,Before Reading_1.1,Warm-up Questions,Whats the weather like in your hometown? Do you like it? Why or why not? Have you ever noticed any changes in your hometown or in the city youre now living in? What are they? Do you have any idea of the greenhouse effect? How
2、does it affect the temperature on Earth?,1. 2. 3.,Background Information,Global warming refers to an average increase in the Earths temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plant
3、s, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities.,Before Reading_3.16,Glacier, an enduring accumulation of ice, snow, water, rock, and sediment （沉淀物） that moves under the influence of gravity. Glaciers f
4、orm where the temperature is low enough to allow falling snow to accumulate and slowly transform into ice. This accumulation is most common in the polar regions, but can also occur at high altitudes on mountains even near the equator. Glaciers are complex systems that grow and shrink in response to
5、climate. At the present, glacier ice covers about 15 million sq km，or 10 percent, of Earths land area.,Before Reading_3.17,Polar Ice Cap,A polar ice cap is a high-latitude region, centered in the polar region, which is covered in ice.,Manhattan is one of the five boroughs that comprise the City of N
6、ew York. It is by far the most densely populated county in the United States and famous for its soaring skyscrapers，including the United Nation Headquarter， Empire State Building，Greenwich village，Chinatown，Broadway， Times Square.,Before Reading_3.10.3,Before Reading_3.10.3,Before Reading_3.10.3,Wri
7、ting Strategy,Problem (What is it?) Causes (Why?) Solutions (How?),Globe Reading.1,Structure of the Text,Main Ideas,Parts,1,1 7,2,8 18,3,19 22,It introduces an essential gas to life carbon dioxide and its influence.,It analyzes what carbon dioxide does to the temperature of the Earth and the factors
8、 that cause the concentration of it.,It gives us some suggestions to deal with the problems.,Read the text and finish the following True or False questions.,1. Carbon dioxide is very poisonous, although it is present in the atmosphere in a small quantity, it does us harm. 2. Carbon dioxide is one of
9、 the essential gases to life in the atmosphere. 3. The sea level is rising very slowly from year to year, mainly because of too much rain in these areas. 4. Among the gases in the atmosphere, only the concentration of carbon dioxide may result in preventing heat around the Earth from escaping.,True
10、or False,5. The concentration of carbon dioxide increased steadily and it will be twice what is now by 2020. 6. Burning coal, oil and natural gas are ways to reduce carbon dioxide in the atmosphere. 7. People are the real villains actually. 8. In order to save ourselves, we must have new sources of
11、fuel that do not involve the production of carbon dioxide. FTFT TFTT,Language Points & Sentence Analysis,villain: n. 1) a bad person who harms other people or breaks the law Hes either a hero or a villain, depending on your point of view. 2) (infml) something or someone considered harmful or dangero
12、us Weve always been told that cholesterol (胆固醇), in foods like eggs, was a major cause of heart disease but, actually, saturated(饱和的) fat is the worst villain. Translate: 这个问题的另一元凶在于政府本身. Another villain in the problem is the government itself.,poisonous: adj. containing or having the effect of pois
13、on,Can you tell the difference between poisonous mushrooms and edible (可食用的) varieties? Translate: 这种药如大量服用是有害的。 This medicine is poisonous if taken in large quantities.,essential,1) n. a basic thing that you cannot live without Because I live in a remote village, I regard my car as an essential. 我们
14、只来得及装上几件必需品。 We only had time to pack a few essentials. 2) adj. necessary； needed It is essential for us to try to decide whether television is a blessing or a curse. Compare: essential, necessary & indispensable,retreat,1) vi. fall or draw back; withdraw or retire The defeated army had to retreat h
15、astily from the battle field. 2) n. withdrawal Enemy soldiers are now in full retreat. make/ carry out a retreat a hasty retreat in full retreat 全线撤退,widespread: adj. found, placed, etc., in many places,Malnutrition in the region is widespread affecting up to 78% of children under five years old. Tr
16、anslate: 竞选运动得到了广泛的支持。 The campaign has received widespread support.,collapse,1) vi. fall down suddenly because of pressure or lack of strength or support Thousands of buildings collapsed in the earthquake. The bridge collapsed under the weight of the train. 2) n. the sudden failure of a system, organization, business, etc. Negotiations between the two countries are on the brink / verge of collapse. 两国的谈判濒于失败。,alternative,1) n. sth. that is different from something e
